We're dividing 78520515 by 511 
We want to divide 78520515 by 511.

Advancing to step 1:
511 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 511

Step 2:
511 can be fit into 78 0 times, resulting in a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Take the next digit (5) from the dividend and append it to 78, then repeat: 785 / 511

On to step 3:
511 goes into 785 1 times with a remainder of 274.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 511 from 785, we get 274.
Grab the next digit (2) from the dividend, add it to 274, then carry on: 2742 / 511

On to step 4:
2742 divided by 511 is 5 with a remainder of 187.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 2555 from 2742 leaves us with 187.
Take the next digit (0) from the dividend and append it to 187, then repeat: 1870 / 511

Going ahead to step 5:
511 goes into 1870 3 times with a remainder of 337.
The next digit of our result is 3. 
Result so far: 153.0
If we subtract 1533 from 1870, we get 337.
Take the next digit (5) from the dividend and append it to 337, then repeat: 3375 / 511

Going ahead to step 6:
511 goes into 3375 6 times with a remainder of 309.
The number 6 becomes the next digit in our result. 
Result so far: 1536.0
The remainder is 309 after subtracting 3066 from 3375.
Grab the next digit (1) from the dividend, add it to 309, then carry on: 3091 / 511

On to step 7:
If we divide 3091 by 511, we get 6 and a remainder of 25.
Record the quotient 6 as the next digit in the result. 
Result so far: 15366.0
The remainder is 25 after subtracting 3066 from 3091.
Take the next digit (5) from the dividend and append it to 25, then repeat: 255 / 511

Going ahead to step 8:
The number 511 fits into 255 0 times, leaving a remainder of 255.
Write down 0 as next digit of the result. 
Result so far: 153660.0
The remainder is 255 after subtracting 0 from 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Moving on to step 9:
511 can be fit into 2550 4 times, resulting in a remainder of 506.
The number 4 becomes the next digit in our result. 
Result so far: 153660.4
The remainder is 506 after subtracting 2044 from 2550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Step 10:
511 goes into 5060 9 times with a remainder of 461.
The number 9 becomes the next digit in our result. 
Result so far: 153660.49
Subtracting 4599 from 5060 leaves us with 461.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4610, and continue the process.

Going ahead to step 11:
511 goes into 4610 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 153660.499
The remainder is 11 after subtracting 4599 from 4610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final outcome is 153660.499, with a leftover of 0.0011.